S300 field test?
Eight systems is a significant presence, and would allow engagement of cruise missile swarms, as well as piloted aircraft, so a stress test may be a better description, and apparently the S400s will remain in place defending Russians.
The political component might be described as "fed up".
Field test for the Israelis too. Maybe even targets. If one of these systems targets Israeli fighters, they too become targets. It might be a good test to watch.
Are there any F-22s or F-35s in the region that we can have test out their systems? (Hopefully send the Russians to the scrap yard to start over?)